Keystones — Capstone
Five GCSE retrieval questions · 17 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 6
Answer: 4(x + 6)² - 150 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 12cm, angle = 47°. Give your answer to 2 decimal places
Answer: 83.37cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 8:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 29, 98, 57, 90, 66, 85, 47, 74. Give your answer to 2 decimal places
Answer: Mean = 71.33, Median = 74, Range = 69